Utility Warehouse (UW) has launched a Go Unlimited SIM, which costs £13 per month and includes unlimited UK calls, texts and mobile data, plus EU roaming.
It is a competitive deal, but it is not a standalone SIM available to everyone at £13. The advertised price requires you to take at least one other qualifying Utility Warehouse service, such as energy, broadband or Boiler & Home Cover.
The deal is particularly interesting for households that want to combine services, because adding mobile to a UW bundle can reduce the overall cost of your energy or other household services.
What does UW Go Unlimited include?
The Go Unlimited SIM includes:
- Unlimited UK mobile data (subject to 500GB fair-use policy).
- Unlimited UK calls.
- Unlimited UK texts.
- 4G and 5G connectivity where available.
- Wi-Fi calling.
- A 30-day rolling arrangement.
- EU roaming included (up to 14GB of data) at no extra cost.
The plan is designed for people who want unlimited mobile data without taking a long SIM-only contract.
The £13 price is bundled
The £13 price is available when Go Unlimited is taken as part of a wider Utility Warehouse bundle. You need at least one other qualifying UW service.
Qualifying services can include:
- Energy.
- Broadband.
- Boiler & Home Cover.
- Other eligible UW household services.
This makes UW different from a provider such as Simp Mobile, where the mobile plan is sold independently.
The bundle requirement is not necessarily a disadvantage. If you are already considering changing your energy, broadband or home-cover provider, adding the mobile plan could reduce your combined household bill.
UW also promotes multi-service benefits, including its Cashback Card. The company says customers can receive up to 15% cashback from eligible spending, applied to their UW bill, and that new customers can receive bonus credit when switching multiple services.[1]
The important figure is therefore not always the mobile price on its own. It is the total cost of your household services after any eligible bundle saving.
For example:
- Energy as a single service: £238.11 per month.
- Energy as a two service bundle: £229.31 per month.
- Total monthly cost for two service bundle: £242.31 per month.
- Difference between single service and two services total price: £4.20 per month
In that example, the mobile service is not adding the full £13 to the household budget because the bundle has reduced the cost elsewhere. The exact saving depends on the tariffs, usage and services selected.
UW versus Simp Mobile
Simp Mobile is the closest direct alternative to Go Unlimited.
Simp Standard Unlimited costs £12 per month when billed monthly. It includes unlimited UK data, calls and texts, no fixed contract and 10GB of EU roaming.
That makes Simp £1 cheaper than UW when comparing the mobile tariffs alone.
Simp also advertises an effective price of £10 per month when customers pay £30 upfront for three months. This is cheaper overall, but the customer has paid for three months in advance. The £12 monthly option is the fairer comparison for someone who wants to stop paying without having prepaid future months.
| Feature | UW Go Unlimited | Simp Standard Unlimited |
|---|---|---|
| Monthly price | £13 | £12 |
| Fixed-term contract | No | No |
| UK calls and texts | Unlimited | Unlimited |
| UK data | Unlimited, subject to 500GB fair-use policy | Unlimited |
| EU roaming | Up to 14GB | Up to 10GB |
| Monthly billing | Yes | Yes |
| Quarterly payment option | Not required | £30 upfront for three months |
| Other service required | Yes, for the £13 bundled price | No |
| Main advantage | Larger EU allowance and bundle savings | Cheaper standalone monthly price |
Simp is the better choice if you want the lowest standalone monthly price and do not want to move another household service.
UW is the better-value option when adding the SIM helps reduce your energy or total UW bill, or when you qualify for a new-customer reward that makes the total first-year cost lower.
Other no-contract alternatives
giffgaff Unlimited: £20 per month
giffgaff’s unlimited monthly rolling plan costs £20 per month under its current promotional price. It includes unlimited UK data, calls and texts, with up to 5GB of EU roaming. The plan has no fixed contract.[2][3]
Compared with UW:
- giffgaff is £7 more expensive per month.
- Its included EU allowance is 9GB smaller.
- It does not provide UW-style energy or household bundle savings.
giffgaff is still attractive for customers who want the O2 network and a simple standalone rolling plan, but it is more expensive than both UW and Simp.
SMARTY Unlimited: £20 per month
SMARTY’s unlimited plan is listed at £20 per month, with a promotional price of £17. It is a no-contract rolling plan and includes EU roaming, but the roaming allowance is lower than UW’s 14GB allowance.[4]
Compared with UW:
- The standard price is £7 more per month.
- The promotional price is £4 more per month.
- EU roaming is capped at approximately 12GB, depending on the plan.
- It does not provide household energy or broadband bundle benefits.
SMARTY is a good flexible alternative, but it is not cheaper than UW at its standard or promotional price.
VOXI Unlimited: £10 per month
VOXI advertises plans from £10 per month, but its £10 offer is not a like-for-like unlimited data alternative.
The cheaper VOXI plans provide unlimited use for selected social-media services, while ordinary browsing, maps, downloads, video sites and other apps use a separate data allowance. VOXI also charges for EU roaming, currently at £2.45 per day for up to 20GB of data.[5]
Compared with UW:
- The £10 plan is not unlimited for all mobile data.
- EU roaming is not included.
- Roaming can cost £2.45 per day.
- VOXI’s unlimited social-media features do not apply while roaming.
VOXI is cheaper only if you use little general mobile data and rarely travel in Europe. It is not cheaper for someone seeking genuinely unlimited UK data with included EU roaming.
Lebara Unlimited: £24.95 per month
Lebara’s unlimited plan is listed at £24.95 per month on an ongoing basis. A lower introductory price of £12.50 applies only during the first three months. It includes EU roaming, but the ongoing price is substantially higher than UW’s £13.[4]
Compared with UW:
- The ongoing price is £11.95 more per month.
- The lower £12.50 price is temporary.
- It does not offer UW’s energy or household bundle savings.
- The introductory price should not be confused with the long-term cost.
Lebara can be useful for customers who need its international calling features, but it is not a cheaper long-term alternative to Go Unlimited.
Three unlimited: approximately £14.50 per month
Three’s direct unlimited plans are listed at approximately £14.50 per month, depending on the current offer and contract arrangement. EU roaming is subject to a capped allowance and the exact contract terms vary.[4]
Compared with UW:
- Three costs around £1.50 more per month.
- The deal may involve different contract terms.
- EU roaming is capped.
- It does not include UW’s household-bundle discounts.
Three can make sense for customers who already receive strong Three coverage, but UW offers a cheaper monthly price and a larger advertised EU roaming allowance.
iD Mobile: approximately £15 per month
iD Mobile’s unlimited plan is listed at approximately £15 per month. EU roaming is included, but the exact price and contract length vary by offer.[4]
Compared with UW:
- It costs approximately £2 more per month.
- Some offers use fixed-term contracts rather than a straightforward 30-day rolling arrangement.
- It does not provide UW energy or broadband bundle savings.
- The roaming allowance can differ from UW’s 14GB allowance.
iD Mobile is a reasonable alternative for customers who want its network and find a suitable flexible plan, but it is not cheaper than UW on the figures compared here.
### O2 Unlimited: higher price or roaming add-ons
O2 offers unlimited plans and includes EU roaming on selected tariffs, but comparable unlimited plans are generally more expensive than UW. Lower-priced O2 offers may also involve a fixed-term contract or require a roaming add-on for wider international use.
Compared with UW:
- Equivalent unlimited plans usually cost more.
- Some cheaper offers involve longer contracts.
- The overall value depends on the specific roaming allowance and tariff.
- O2 does not provide UW’s energy-bundle saving opportunity.
O2 remains worth considering for customers who prefer its coverage or existing services, but it is not the lowest-cost like-for-like option in this comparison.
Comparison table
| Provider | Price | Contract | Unlimited UK data | EU roaming | Why it is less attractive than UW |
|---|---|---|---|---|---|
| Utility Warehouse | £13 | 30-day rolling | Yes, subject to 500GB fair use | Up to 14GB | Requires another UW service |
| Simp Mobile | £12 monthly | No fixed contract | Yes | Up to 10GB | £1 cheaper as a standalone SIM |
| Simp quarterly | £10 effective monthly | £30 paid upfront | Yes | Up to 10GB | Requires three months’ upfront payment |
| giffgaff | £20 | Monthly rolling | Yes | Up to 5GB | £7 more expensive and smaller EU allowance |
| SMARTY | £20 standard, £17 promotional | Rolling | Yes | Around 12GB | More expensive than UW |
| VOXI | From £10 | No contract | Not on the cheapest plans | Paid roaming | £10 plan is not genuinely unlimited and roaming costs extra |
| Lebara | £24.95 ongoing | No contract | Yes | Included | £11.95 more expensive after introduction |
| Three | Approximately £14.50 | Varies | Yes | Capped | More expensive and terms vary |
| iD Mobile | Approximately £15 | Varies | Yes | Included | More expensive and some deals are fixed-term |
| O2 | Varies, generally higher | Varies | Yes on selected plans | Included on selected tariffs | Higher price or longer contract |
Is UW the cheapest?
For a standalone monthly SIM, no. Simp Mobile’s £12 monthly plan is £1 cheaper than UW and includes unlimited UK data, no fixed contract and 10GB of EU roaming.
However, UW is not selling the £13 tariff as an isolated mobile product. It is a bundled offer. If taking the SIM helps reduce your energy price or other household bills, the total household cost could be lower than buying a £12 SIM separately.
UW also provides a larger EU roaming allowance than Simp:
- UW: 14GB.
- Simp Standard: 10GB.
- giffgaff: 5GB.
- VOXI: paid EU roaming rather than included roaming.
Therefore, the most accurate description is:
> Utility Warehouse Go Unlimited is one of the most competitive bundled unlimited SIM deals, with a 30-day rolling arrangement and up to 14GB of included EU roaming.
It is not accurate to describe it as the cheapest standalone monthly unlimited SIM when Simp’s £12 monthly plan is available.
Who should choose UW?
UW is a strong option for people who:
- Already use Utility Warehouse for energy, broadband or home cover.
- Are planning to switch another household service.
- Want to manage several bills through one provider.
- Need more EU roaming data than Simp or giffgaff provides.
- Want a 30-day rolling SIM rather than an 18- or 24-month contract.
- Can reduce their total household bill through UW’s bundle pricing.
- Qualify for a new-customer bonus or Cashback Card credit.
Simp is the better choice for people who:
- Want the lowest standalone monthly price.
- Do not want to move energy, broadband or home cover.
- Need unlimited UK data and basic EU roaming.
- Are comfortable using an eSIM-only service.
- Do not need UW’s household bundle benefits.
VOXI is suitable only for lighter users who mainly want unlimited selected social-media services and do not need included EU roaming.
giffgaff, SMARTY, Three, iD Mobile and O2 are alternatives for customers who prioritise their preferred network, but they are either more expensive, have smaller roaming allowances, require a longer contract, or charge separately for roaming.
How to calculate the real UW saving
Do not compare the £13 mobile price in isolation if you are taking another UW service.
Use this calculation:
> New combined UW bill − your current combined household bill = your actual monthly difference.
For example:
- Current energy, broadband and mobile total: £155 per month.
- UW energy, broadband and mobile total: £148 per month.
- Overall saving: £7 per month.
In that example, the UW bundle costs £7 less overall, even though the mobile service itself is advertised at £13.
New-customer credit should be treated as a separate first-year benefit rather than a permanent monthly discount. If UW provides £150 of eligible credit, that improves the first-year value, but it does not change the standard monthly mobile tariff.
Final verdict
Utility Warehouse Go Unlimited is a competitive bundled SIM at £13 per month. It provides unlimited UK calls, texts and data, a 30-day rolling arrangement and up to 14GB of EU roaming.
It is not the cheapest standalone monthly unlimited SIM: Simp Mobile is £12 per month when billed monthly. Simp also offers a £10 monthly equivalent when paying £30 upfront for three months, although that requires a three-month prepayment.
UW becomes more attractive when the SIM is added to a wider household bundle. The extra service requirement can unlock energy, broadband or home-cover savings, and eligible new customers may receive promotional credit.
The best choice is therefore straightforward:
- Choose Simp for the cheapest standalone monthly price.
- Choose UW if its bundle reduces your total household bills.
- Choose UW if you need the larger 14GB EU roaming allowance.
- Choose giffgaff or SMARTY only if their network or service features justify their higher price.
- Avoid comparing VOXI’s £10 price directly with UW because its cheapest plan is not unlimited for all data and charges separately for EU roaming.
UW is not the cheapest SIM in every situation, but it can be the better overall deal for a household that wants to consolidate services and reduce its combined bills.
*Prices and allowances in this article are based on information available on 13 September 2026. Promotions and provider terms can change.*
*Disclosure: I am a Utility Warehouse partner. If you sign up through my referral, I may receive a commission or other partner benefit. This does not change the price you pay. This article is intended to provide balanced information, and the comparison includes alternatives that may be cheaper for some customers.*
Citations:
[1] UK's Best Unlimited Data SIM Only Deal | UW - Utility Warehouse https://uw.co.uk/mobile/unlimited-data-sim
[2] Giffgaff SIM Only Deals: Compare Contracts 2026 - Uswitch https://www.uswitch.com/mobiles/compare/sim_only_deals/giffgaff/
[3] How to get the giffgaff unlimited data offer https://help.giffgaff.com/en/articles/702493-how-to-get-the-giffgaff-unlimited-data-offer
[4] The best unlimited SIM in the UK: an honest, like-for-like comparison https://simpmobile.com/compare
[5] VOXI SIM Only Deals: Compare Contracts September 2026 - Uswitch https://www.uswitch.com/mobiles/compare/sim_only_deals/voxi/
[6] Microsoft Word - EE PAYM Standard & Non-Standard Price Guide - from 3 September 2026 _NGCS Upd.docx https://ee.co.uk/content/dam/help/terms-and-conditions/price-plans/mobile/pay-monthly-price-plans/_ee-pay-monthly-standard-and-non-standard-price-guide-3rd_September_2026.pdf
[7] giffgaff SIM-only deals September 2026 - MoneySuperMarket https://www.moneysupermarket.com/mobile-phones/sim-only/networks/giffgaff/
[8] Roaming charges with giffgaff https://www.giffgaff.com/roaming
[9] giffgaff offers Unlimited data for just £14 a month https://mediacentre.giffgaff.com/press-releases/bjd88l1mvtd1o9jdwm0tmye3n5elda
[10] giffgaff Deals & Offers – 300GB for £20 - BudgetFitter https://budgetfitter.uk/brand/giffgaff/
[11] giffgaff's £14 Unlimited Data: With 5G Coverage & EU Roaming https://kenstechtips.com/index.php/giffgaff-unlimited-data
[12] Best SIMs for EU Roaming in the UK (2026) https://dealpricecheck.com/guides/best-sims-for-eu-roaming/
[13] Everything you need to know about roaming in the EU https://help.giffgaff.com/en/articles/229458-everything-you-need-to-know-about-roaming-in-the-eu
[14] Giffgaff Goodybags - Rolling plans on Pay As You Go - 4G https://www.4g.co.uk/news/giffgaff-golden-goodybags/
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